We prove Holder-continuous dependence results for the difference between certain ill-posed and well-posed evolution problems in a Hilbert space.Specifically, given a positive self-adjoint operator D in a Hilbert space, we consider the ill-posed evolution problem $$displaylines{ frac{du(t)}{dt} = A(t,D)u(t) Appetite Control quad 0leq t<T cr u(0) = chi.}$$ We determine functions $f:[0,T]imes [0,infty)o mathbb{R}$ for which solutions of pajama set the well-posed problem $$displaylines{ frac{dv(t)}{dt} = f(t,D)v(t) quad 0leq t<T cr v(0) = chi }$$ approximate known solutions of the original ill-posed problem, thereby establishing continuous dependence on modelling for the problems under consideration.